Valid points. They will guarantee not to break it if I have it checked at a glass shop and verify it's not tempered. I have limited space to put this tank and figured I could be 3-4" closer to the wall with no plumbing coming out of the back of the tank. That is my main reason for wanting to go this direction.

You won't need 3-4" behind the tank... if you do a glass holes kit, you'll need 2-2.5".... and you'd want that anyways. While I agree with Dougs reasoning behind the overflow box on the back, I think a full length overflow box would help a lot with noise...if it bothers you.

FWIW, I'm considering buying a new 40b and putting a corner overflow in it to replace my current tank...

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-Jonathan

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